This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 114a. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.

2024-04-18

236. Explicit temporaries and integral constant expressions

Section: 7.7  [expr.const]     Status: NAD     Submitter: Mike Miller     Date: 19 Jul 2000

Does an explicit temporary of an integral type qualify as an integral constant expression? For instance,

    void* p = int();    // well-formed?

It would appear to be, since int() is an explicit type conversion according to 7.6.1.4 [expr.type.conv] (at least, it's described in a section entitled "Explicit type conversion") and type conversions to integral types are permitted in integral constant expressions (7.7 [expr.const]). However, this reasoning is somewhat tenuous, and some at least have argued otherwise.

Note (March, 2008):

This issue should be closed as NAD as a result of the rewrite of 7.7 [expr.const] in conjunction with the constexpr proposal.

Rationale (August, 2011):

As given in the preceding note.